THE TRIGEMINAL NERVE 63 



branches from the cervical sympathetic, which enter the skull 

 in company with the internal carotid artery (p. 186). These 

 branches are destined to supply the dilator muscle of the iris. 



FIG. 35. Interior of the Skull after the removal of the Brain, showing the 

 points of exit of the twelve cerebral nerves. 



The small motor root takes no part in the formation of the 

 semilunar ganglion. Since it lies between the ganglion and 

 the bone, it can be left behind uninjured when the ganglion is 



